It makes since to me.The old saying ‘You can only hang a man once’ comes into play.
Or perhaps, ‘in for a penny, in for a pound’.
May make a difference, however, as to whether she ends up spending under 10 years in prison on a life sentence, or whether she spends closer to 15. Parole should hinge, however, on whether she has any other ex-husbands out there. If not, she might be a good risk for earlier release.
15 years for killing two people. Why not the death penalty?